vkg-oai d838c2346d Allow idle threads to prewarm and repair WebSocket connections (#47701) ...

## Why

A previously used WebSocket can close while a thread is idle. Hosts need a way to prepare the connection before the next turn without repeating warmup on a healthy connection.

## What changed

- Expose `CodexThread::prewarm()` using the existing startup warmup and next-turn handoff.
- Reuse healthy connections and pending warmups, retry failed warmups, and repair closed connections. Treat a finished WebSocket reader task as a closed connection.
- Skip scheduling during an active turn or shutdown, and stop warmup admission before shutdown takes the pending task.
- Expose `active_turn_environment_selections()` so hosts can inspect the environments captured by the active turn, including those still starting or failed, when authorizing steering.

## Testing

Add regression coverage for repeated idle prewarm calls, healthy connection reuse with preserved response continuation, reconnection with `generate: false`, and warmup rejection after shutdown. Update delayed MCP discovery coverage to verify prewarm repairs an eagerly closed socket and the first turn reuses it.

GitOrigin-RevId: aa164b91a399de2375eda3bf28397725439fce93

2026-09-24 00:37:56 +00:00

..

common

Allow WebSocket test server shutdown while waiting for requests (#47698)

2026-09-23 23:44:23 +00:00

remote_env_windows

Apply remote platform semantics to exec safety checks (#42113)

2026-09-01 18:24:56 +00:00

suite

Allow idle threads to prewarm and repair WebSocket connections (#47701)

2026-09-24 00:37:56 +00:00

all.rs

[codex] Use expect in integration tests (#28441)

2026-06-15 21:53:47 -07:00

mcp_trace_propagation.rs

Preserve MCP request trace context across transport workers (#47212)

2026-09-22 06:47:07 +00:00

responses_headers.rs

Add extension hooks for model requests and response streams (#47679)

2026-09-23 22:10:04 +00:00